Ments



(No Model.)

J. TEMLER.

RIVET. No. 571,177. Patented Nov. 10,1896.

efigl/ a??? I dZy-J Q eifyd 0 UNITED STATES PATENT OFFICE.

JOSEF TEMLER, OF LoNDoN, ENGLAND, ASSIGNOR, BY MEsNE ASSIGN- MENTS, TOTHE NATIONAL METAL EDGE BOX COMPANY, on NEW JERSEY.

RIVET.

SPECIFICATION formingpart of Letters Patent No. 571,177, dated November10, 1896.

Application filed October 14, 1895. Serial No. 565,621. (No model.)Patented in England August 30, 1893, No. 16,335,

and in Germany June '7, 1894: No. 75,443.

To caZZ whom it may concern.-

Be it known that I, J OSEF TEMLER, a subject of the Emperor of Russia,residing at London,in the Kingdom of Great Britain, have invented acertain new and useful Improvement in Rivets, (for which I have obtaineda patent in Great Britain, dated August 30, 1893, No. 16,335, and apatent in Germany, dated June 7, 1894, No. 753443;) and I do herebydeclare that the following is a full, clear, and exact description ofthe invention, which will enable others skilled in the art to which itappertains to make and use the same.

The present improvement relates to the manufacture of sheet-metalrivets, such as shown in the accompanying drawings, in Figures 1 to 3with a round head, (see Fig. 3,) in Fig. 3 with a polygonal head, thesurface of the head being flat or shaped as shown in Figs. 1 and 2, theedge being furnished with two long riveting-points and two shortguiding-points interposed between the former.

Heretofore in making such rivet-blanks, such as shown in Fig. 4, theyhave. been punched and afterward by stamping transformed into rivets;but this method presents the disadvantage that between two rows ofblanks a strip of metal is wasted, such as is shown by the cross-liningin Fig. 4, and this represents a loss of material which increases thecost of the clamps or rivets.

The work of grinding of the punches or cutters for such blanks is alsoexcessive.

Now according to my invention the improved method of forming sheet-metalrivets presents the advantage that there is no loss of metal between theblanks; and as the cutting-tool employed has straight edges it can moreeasily be sharpened than those heretofore in use with curved edges.

In my improved method strips of metal are used the width whereof is eventhroughout and corresponds with the diameter of the rivets to be formedtherefrom. From such a metal strip a, Fig. 5, pieces a are severed eachby a rectilineal out. These pieces have the shape of a rhomb. To obtainsuch a rhomb a, one straight out passing through the metal strip a at agiven angle is required for each blank, and thus loss of metal betweenthe blanks is avoided. The rhombs so obtained are next transformed intorivets, such as shown in Figs. 1 to 3 and 3, by the known method and theknown tool shown in Fig. 6. In this operation the acute-angled cornersof the rhomb ct make the riveting-points and the obtuseangled ones theshort guide-points between them. This method of production not onlyoffers the advantages already set forth, 2'. 6., saving of material andsimplification of the cutter, but, in addition, improves the rivetsthemselves, as will appear from the following: In order to connect partsby means of such rivets, the points of the rivets are driven into thematerial to be united by means of a forcible blow on the head. In thisoper ation the points mustthemselve's force their way through thematerial, and therefore must present considerable stiffness, so thatthey may not be bent. Bending, however, when it occurs, takes place mostreadily at the base of the riveting-points, that is to say, at the bendbetween the head and the points. Obviously that point will have theleast tendency to bend which has the broadest base. Now, as will be seenin Figs. 7 and 8 of the drawings, those produced by the present method,Fig. 8, are the points having the broadest base. Fig. 7 shows arivet-blank made as heretofore; Fig. 8, one made as herein specified. Ineach case the dotted circle shows Where the bend will afterward come andform the base. of the points.

Obviously the base of the riveting-point in the blank made according tothe present im provement is larger than in the old process.

Having fully described my invention what I claim, and desire to secureby Letters Patent of the United States, is-

1. A sheet-metal rivet made from a rhombshaped blank and composed of acircular head, riveting-points formed from the acute I corners of theblank, and guide-points formed from the obtuse corners of the blank,said riveting and guide points being bent directly from and at rightangles to the circular head in contradistinction to being bent partlybeneath the head, substantially as set forth.

2. A new and improved rivet formed from a specification in the presenceof the subscribi-hoinb-shaped blank and having the acute ing Witnesses.and obtuse angles of the blank bent at right angles With the head toform riveting and 5 guiding points respectively, substantially asdescribed.

In testimony whereof I have signed this JOSEF TEMLER.

\Vitnesses:

O. F. ROSENCRANTZ, HERNANDO DE SOTO.

